Run Ruby Script From Command Line With Arguments

The python sys module provides access to any command line arguments via the sys argv.

Run ruby script from command line with arguments.

To get the number of command line arguments passed in to your ruby script check argv length like this. Shell scripts also accept command line arguments similar to nix commands. The script should ask you for your. Consider the following script test py.

Len sys argv is the number of command line arguments. Ruby command line argv check length rb one too few arguments ruby command line argv check length rb one two working on one two values received on the command line are strings. Ruby script arguments are passed to the ruby program by the shell the program that accepts commands such as bash on the terminal. Optionparser will automatically generate help screens for you from this description as well as infer everything about the argument from its description.

When written inside your ruby program argv will take take a command line command that looks like this. 1 getting the number of command line args. Open a command line window and navigate to your ruby scripts directory using the cd command. Quit unless our script gets two command line arguments unless.

You only have to write the command line switch its arguments the code to run when it s encountered and the command line switch description once in your script. Once there you can list files using the dir command on windows or the ls command on linux or os x. Ruby is generally run from the command line in the following way ruby options programfile arguments. On the command line any text following the name of the script is considered a command line argument.

Your ruby files will all have the rb file extension. Here are a few examples. In this snippet of code we first check if we got exactly 2 parameters and we do we add them together. Ruby captures command line arguments with a special array named argv.

And create an array that looks like this. This serves two purposes sys argv is the list of command line arguments. To run the test rb ruby script run the command ruby test rb. To read command line args in a ruby script use the special ruby array argv to get the information you need.

Here sys argv 0 is the program ie. Ruby testing argv rb these are elements in the argv array. Using command line arguments.